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Besides present DocumentLine annotatable it would be useful to have a <start-ofset, end-offset> Annotatable spanning arbitrary number of lines. This would be useful for marking modified areas of source in VCS that currently uses a workaround solution by using many line annotatables to create illusion of a continuous annotated area which brings performance issues. Please see issue 65433 and issue 65128 for details.
Reassigning to new module owner mslama.